40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  ATF eLog  Not logged in ELOG logo
Entry  Wed Jul 15 23:17:14 2015, Alessandra, Misc, Seismometer, Rhomboid motion Sensors.JPGfoto_.JPGfoto_(1).JPG
    Reply  Thu Jul 16 10:21:39 2015, Koji, Misc, Seismometer, Optical lever installation (Re: Rhomboid motion) 
Message ID: 1978     Entry time: Wed Jul 15 23:17:14 2015     Reply to this: 1979
Author: Alessandra 
Type: Misc 
Category: Seismometer 
Subject: Rhomboid motion 

Today me and Koji set up the sensors to mesure the rhomboid motion as shown in the attachments.

We are using a fiber-coupled laser and a QPD. The QPD can be calibrated: we are going to determine the calibration curve to obtain the Volts/displacement ratio.

Attachment 1:scheme of the optics used.

Attachment 2, 3:  picture of the system. We put an additional mirror on the rhomboid to balance the one we needed to sense motion.

We also put a mass on the bottom surface of the rhomboid to balance it.

Attachment 1: Sensors.JPG  433 kB  | Hide | Hide all
Attachment 2: foto_.JPG  1.607 MB  | Hide | Hide all
Attachment 3: foto_(1).JPG  1.712 MB  | Hide | Hide all
ELOG V3.1.3-